Chatot, the Music Note Pokémon, appears from a Poké Ball! It can mimic the voices of humans or other Pokémon, and can even attack with sound waves!
When Chatot appears, it takes off into the air, then flies back and forth while using its signature move, Chatter!
Chatter is an attack that uses sound to create shockwaves. However, its range is limited to a short area around Chatot, and its flight pattern is rather predictable. If your foe uses a Chatot, your best bet is to keep away from it!